If you actually read the post, you would see that the device would normally purge its buffer after it finished augmenting / vision processing those frames. Only because it was forcefully shut off was the data retained.

An angry rent-a-cop in the face of the person wielding the camera would not know this.

If you're willing to believe that via a malfunction he was able to get photos off, you've missed my point.

Its possible because they're there. Anything beyond that is arguing against the reality of the photos on the web page.